app/views/spree/checkout/_confirm.html.erb
<fieldset id="order_details" data-hook>
<div class="clear"></div>
<legend align="center"><%= Spree.t(:confirm) %></legend>
<%= render :partial => 'spree/shared/order_details', :locals => { :order => @order } %>
</fieldset>
<br />
<div class="form-buttons" data-hook="buttons">
<%= submit_tag Spree.t(:place_order), :class => 'continue button primary' %>
<script>Spree.disableSaveOnClick();</script>
</div>